The tactics of blocking roads must be used reasonably, so that enemy soldiers can take the longest route and suffer the most fire attacks.

At the beginning of this level, the line near the light spot was blocked with a machine gun tower, and then the key positions were slowly blocked, and then the fence was gradually built with a machine gun tower. Another thing to note is that before the first wave of air force appears, an air defense tower will be added to seal the empty road, and an auxiliary will be added in the medium term, so pay attention to the upgrade. If you have enough money, add turrets or upgrade machine gun towers at key points. Pay attention to the rational use of deceleration tower, and place deceleration tower at some corners, which has a particularly good effect.

The following picture shows the blocking method of the last level, and the arrow line shows the route that monsters are driven away, so as to ensure that they can enjoy the maximum flame baptism.